PatchTheCVECVE-2021-30665: Apple Multiple Products WebKit Memory Corruption Vulnerability
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HIGH 8.8EXPLOITEDUPGRADEUPGRADEUPGRADE
CVE-2021-30665 is a high-severity flaw (CVSS 8.8) affecting ipados, iphone os, macos, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
A memory corruption issue was addressed with improved state management. This issue is fixed in watchOS 7.4.1, iOS 14.5.1 and iPadOS 14.5.1, tvOS 14.6, iOS 12.5.3, macOS Big Sur 11.3.1. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited..
Why this priority
- High severity
- Exploited in the wild (CISA KEV)
A fixed release or distro patch exists.
Risk facts
| CVSS score | 8.8 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 3.7% (top 10%) |
| CISA exploited list | Yes, fix due 2021-11-17 |
| Weakness | CWE-787 |
| Published | 2021-09-08 |
| Last modified | 2026-06-17 |
Publisher (CNA): Apple Inc. · Vendor: apple
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Exploited Added to the CISA Known Exploited Vulnerabilities list
- Deadline CISA due date for US federal agencies to patch
- Updated Record last modified
apple ipados UPGRADE
Affected: < 14.5.1
Fixed in: 14.5.1
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
apple iphone os UPGRADE
Affected: < 12.5.3 · >= 13.0 and < 14.5.1
Fixed in: 12.5.3, 14.5.1
Safe to downgrade to: a release before 13.0
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
apple macos UPGRADE
Affected: < 11.3.1
Fixed in: 11.3.1
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
apple tvos UPGRADE
Affected: < 14.6
Fixed in: 14.6
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
apple watchos UPGRADE
Affected: < 7.4.1
Fixed in: 7.4.1
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
Exact fixes by distribution
Fedora 46 · python-dtoc · FIXED · 0.1.0-1.fc46 · FEDORA-2026-e4734649a1 · source
sudo dnf upgrade --advisory=FEDORA-2026-e4734649a1
Fedora ELN · parallel · FIXED · 20261022-1.eln159 · FEDORA-2026-6d961c0286 · source
sudo dnf upgrade --advisory=FEDORA-2026-6d961c0286
Ubuntu 22.04 · webkit2gtk · FIXED · 2.32.3-1ubuntu1
sudo apt update && sudo apt install --only-upgrade webkit2gtk
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' webkit2gtk)" ge "2.32.3-1ubuntu1" && echo PATCHED || echo STILL-VULNERABLE
Ubuntu 20.04 · webkit2gtk · FIXED · 2.32.3-0ubuntu0.20.04.1
sudo apt update && sudo apt install --only-upgrade webkit2gtk
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' webkit2gtk)" ge "2.32.3-0ubuntu0.20.04.1" && echo PATCHED || echo STILL-VULNERABLE
Ubuntu 24.04 · webkit2gtk · FIXED · 2.32.3-1ubuntu1
sudo apt update && sudo apt install --only-upgrade webkit2gtk
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' webkit2gtk)" ge "2.32.3-1ubuntu1" && echo PATCHED || echo STILL-VULNERABLE
Debian 12 · webkit2gtk · FIXED · 2.32.3-1
sudo apt update && sudo apt install --only-upgrade webkit2gtk
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' webkit2gtk)" ge "2.32.3-1" && echo PATCHED || echo STILL-VULNERABLE
Debian 13 · webkit2gtk · FIXED · 2.32.3-1
sudo apt update && sudo apt install --only-upgrade webkit2gtk
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' webkit2gtk)" ge "2.32.3-1" && echo PATCHED || echo STILL-VULNERABLE
Debian 12 · wpewebkit · FIXED · 2.32.3-1
sudo apt update && sudo apt install --only-upgrade wpewebkit
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' wpewebkit)" ge "2.32.3-1" && echo PATCHED || echo STILL-VULNERABLE
Debian 13 · wpewebkit · FIXED · 2.32.3-1
sudo apt update && sudo apt install --only-upgrade wpewebkit
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' wpewebkit)" ge "2.32.3-1" && echo PATCHED || echo STILL-VULNERABLE
RHEL 7 Extended Lifecycle Support · webkitgtk4 · FIXED · webkitgtk4-2.48.3-2.el7_9
sudo dnf upgrade --advisory=RHSA-2025:10364
rpm -q webkitgtk4
RHEL 8 · webkit2gtk3 · FIXED · webkit2gtk3-2.32.3-2.el8
sudo dnf upgrade --advisory=RHSA-2021:4381
rpm -q webkit2gtk3
RHEL 6 · webkitgtk · NO FIX YET
RHEL 7 · webkitgtk3 · NO FIX YET
RHEL 9 · webkit2gtk3 · NOT AFFECTED
Alpine 3.20 · webkit2gtk · FIXED · webkit2gtk-2.32.3-r0
apk add --upgrade webkit2gtk
apk info -v webkit2gtk
sudo yum update --advisory=ALAS2-2023-2088
Verify at the official source NVD · CVE Program · CISA KEV catalog · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-30665?
ipados: upgrade to 14.5.1; iphone os: upgrade to 12.5.3, 14.5.1; macos: upgrade to 11.3.1. Exact commands for each OS are on this page.
Is CVE-2021-30665 being exploited?
Yes. CVE-2021-30665 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.
What does CVE-2021-30665 affect?
CVE-2021-30665 affects ipados, iphone os, macos. Severity is high (CVSS 8.8). A memory corruption issue was addressed with improved state management. This issue is fixed in watchOS 7.4.1, iOS 14.5.1 and iPadOS 14.5.1, tvOS 14.6, iOS 12.5.3, macOS Big Sur 11.3.1. Processing maliciously crafted web content may lead to
How urgent is CVE-2021-30665?
Priority 78/100. High severity; Exploited in the wild (CISA KEV)
Software pages
iOS vulnerabilities · macOS vulnerabilities · WebKit vulnerabilities · Apple Safari and WebKit vulnerabilities · iPadOS vulnerabilities · watchOS vulnerabilities
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